Scientific American Frontiers"Life's Little Questions II"
Why can't you tickle yourself? If tickling isn't social, why are we ticklish in the first place? What is laughter and why do we laugh? Why can't scientists cure the common cold? Why does wet sand rise in a halo around your feet when you walk on the shore? Why do Brazil nuts always rise to the top of a can of mixed nuts? Why do coffee spills leave rings when they dry?G

9:00 pm

Inventions That Shook The World"The 1910's"
Saving lives and taking lives are the hallmarks of this decade. The umbrella supplies the inspiration for a new device that lets airplane pilots parachute to safety. Sonar navigation comes to the aid of ships at sea; and a garment manufacturer develops the first safety hood to protect firefighters inside burning buildings.G

10:00 pm

NOVA"Building Pharaoh's Chariot"
A team of archaeologists, engineers, woodworkers and horse trainers builds and tests two accurate replicas of Egyptian royal chariots. Driving them to their limits in the desert outside Cairo, NOVA's experts test the claim that the chariot marks a crucial turning point in ancient military history.G